using System;
public static class UserPreferences {
    public static Color BackColor {get;}

    static UserPreferences() {
        DateTime now = DateTime.Now;
        if (now.DayOfWeek == DayOfWeek.Saturday || now.DayOfWeek == DayOfWeek.Sunday ) {
            BackColor = Color.Green;
        } else {
            BackColor = Color.Red;
        }
    }
}